This volume contains 20 papers dealing with internal combustion engines. Topics include: the effect of cylinder charge motion on combustion; turbulence structure in the spark ignition engine; a method of direct-injection diesel emissions control; the Cranfield-Kushul engine; a mathematical model of diesel combustion; analysis of performance losses in a Wankel engine; and vehicle emission and urban amenity. The volume also contains discussions of the papers, written contributions, and the authors' replies.